feat(hosts): add drag-and-drop and global subscription ordering (#6895)

Hosts already had one saved order on the Hosts page, but subscriptions honoured
it only inside each inbound, so a host of a later inbound could never come before
one of an earlier inbound (#6894). A new opt-in setting makes raw/base64,
Clash/Mihomo and JSON subscriptions follow the Hosts page order across inbounds;
the default keeps today's inbound-first output unchanged. The Hosts table gains
drag-and-drop reordering next to the Up/Down buttons, on a pointer-reorder hook
the Routing Rules table now shares.

internal/web/entity/entity.go

@@ -38,6 +38,7 @@ type AllSetting struct {
 	RemarkTemplate             string `json:"remarkTemplate" form:"remarkTemplate"`
 	SubShowIdentityOnAllLinks  bool   `json:"subShowIdentityOnAllLinks" form:"subShowIdentityOnAllLinks"`
 	SubInfoNodeEnable          bool   `json:"subInfoNodeEnable" form:"subInfoNodeEnable"`
+	SubHostSortMode            string `json:"subHostSortMode" form:"subHostSortMode" example:"inbound-first"`
 	SubCalendarExpireInclusive bool   `json:"subCalendarExpireInclusive" form:"subCalendarExpireInclusive"`
 	SubExpiredTemplate         string `json:"subExpiredTemplate" form:"subExpiredTemplate"`
 	SubTrafficDepletedTemplate string `json:"subTrafficDepletedTemplate" form:"subTrafficDepletedTemplate"`